Combining laser-induced fluorescence and light-scattering microscopies to diagnose low-fluence damage precursors on KDP-based crystal surface

被引：0

作者：

Deng, Qinghua ^{[1
]}

Sun, Laixi ^{[1
]}

Huang, Jin ^{[1
]}

Wang, Fengrui ^{[1
]}

Zhou, Xiaoyan ^{[1
]}

Ye, Xin ^{[1
]}

Xia, Handing ^{[1
]}

Shi, Zhaohua ^{[1
]}

Shao, Ting ^{[1
]}

Li, Weihua ^{[1
]}

Li, Bo ^{[1
]}

Zheng, Wanguo ^{[1
]}

机构：

[1] China Acad Engn Phys, Res Ctr Laser Fus, Mianyang, Sichuan, Peoples R China

来源：

OPTICAL ENGINEERING | 2024年 / 63卷 / 02期

基金：

中国国家自然科学基金;

关键词：

lase damage; fluorescence microscopy; nonlinear optical materials; DEFECTS; SILICA; IRRADIATION;

D O I：

10.1117/1.OE.63.2.025107

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

. The maximal output fluence of high-power laser systems remains limited by KH2PO4 (KDP)-based optical components used to convert the infrared pulses to 3 omega pulses. The correlation between optical defects (scales of a few micrometers) on KDP crystal surfaces and damage initiation was systematically investigated by combining laser-induced fluorescence (FL) and light-scattering microscopies incorporated an in-situ damage testing facility (wavelength at 355 nm and pulse width of 7 ns). We demonstrated that the surface defects featuring both FL and light-scattering have a high propensity to damage. The scattering feature of the FL precursors was found to be a key factor for damage initiation, whose physical mechanism was thoroughly revealed. The results further implied that the removal of such damage precursors can greatly improve the damage resistance of KDP-based crystals. Considering that this combined imaging technique is noninvasive, the results establish this methodology as an attractive and non-destructive tool for evaluating and improving the surface damage performance of KDP-based crystals used in high-power lasers.

引用

页数：7